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Commit | Line | Data |
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a733cb60 LT |
1 | #ifndef PACK_H |
2 | #define PACK_H | |
3 | ||
1974632c | 4 | #include "object.h" |
a733cb60 LT |
5 | |
6 | /* | |
7 | * Packed object header | |
8 | */ | |
9 | #define PACK_SIGNATURE 0x5041434b /* "PACK" */ | |
29f049a0 | 10 | #define PACK_VERSION 2 |
d60fc1c8 | 11 | #define pack_version_ok(v) ((v) == htonl(2) || (v) == htonl(3)) |
a733cb60 | 12 | struct pack_header { |
bb791031 SS |
13 | uint32_t hdr_signature; |
14 | uint32_t hdr_version; | |
15 | uint32_t hdr_entries; | |
a733cb60 LT |
16 | }; |
17 | ||
df1b059d SP |
18 | /* |
19 | * Packed object index header | |
20 | * | |
21 | * struct pack_idx_header { | |
22 | * uint32_t idx_signature; | |
23 | * uint32_t idx_version; | |
24 | * }; | |
25 | * | |
26 | * Note: this header isn't active yet. In future versions of git | |
27 | * we may change the index file format. At that time we would start | |
28 | * the first four bytes of the new index format with this signature, | |
29 | * as all older git binaries would find this value illegal and abort | |
30 | * reading the file. | |
31 | * | |
32 | * This is the case because the number of objects in a packfile | |
33 | * cannot exceed 1,431,660,000 as every object would need at least | |
34 | * 3 bytes of data and the overall packfile cannot exceed 4 GiB due | |
35 | * to the 32 bit offsets used by the index. Clearly the signature | |
36 | * exceeds this maximum. | |
37 | * | |
38 | * Very old git binaries will also compare the first 4 bytes to the | |
39 | * next 4 bytes in the index and abort with a "non-monotonic index" | |
40 | * error if the second 4 byte word is smaller than the first 4 | |
41 | * byte word. This would be true in the proposed future index | |
42 | * format as idx_signature would be greater than idx_version. | |
43 | */ | |
44 | #define PACK_IDX_SIGNATURE 0xff744f63 /* "\377tOc" */ | |
45 | ||
f3bf9224 | 46 | extern int verify_pack(struct packed_git *, int); |
a69e5429 JH |
47 | |
48 | #define PH_ERROR_EOF (-1) | |
49 | #define PH_ERROR_PACK_SIGNATURE (-2) | |
50 | #define PH_ERROR_PROTOCOL (-3) | |
51 | extern int read_pack_header(int fd, struct pack_header *); | |
a733cb60 | 52 | #endif |